Exhaust/Intake Questions

GM Duraturd · #1 (**permalink**) 02-25-2008, 04:23 PM

Does anyone know how much power you gained by just doing a free-flow filter and 4'' straight pipe exhaust. What about added mpg? Also how hard is it to install a 3'' downpipe on a 1997 7.3? Thanks.

**Farmboy444** · #2 (**permalink**) 02-25-2008, 04:28 PM

i got 2 mpg better and it wasnt hard with the DP takes 2 people, no idea on power but the economy is what matters

GM Duraturd · #3 (**permalink**) 02-25-2008, 04:38 PM

thanks... yeah the extra mpg's are always great and the added power and sweet sound majke it even better.

**Farmboy444** · #4 (**permalink**) 02-25-2008, 04:40 PM

yeah youll love the sound and itll be more responsive also

Triflex · #5 (**permalink**) 02-25-2008, 05:17 PM

I started doing a 3" DP today and I have to get the DP in a very tight place tomorrow. Somethings gotta give. Anyone know the best way. The tools I have are hand tools and a sawzall.

good o boy · #6 (**permalink**) 02-26-2008, 05:16 PM

If your DP is one piece what i did is cut it in half and took it to a muffler shop and had them spead the top part with there machine and put it in two pieces I also had to bend where the fire wall and floor met (air hammer works great)
97 F350 3'' dp 4'' out

**Farmboy444** · #7 (**permalink**) 02-26-2008, 05:21 PM

for a OBS you have to have a 2 piece DP a single wont fit. ITs kinda tight but it is pretty easy with 2 guys if possible

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